Explanation

The method of smelting pig iron and scrap steel into steel in open hearth furnace (also called Martin furnace) is adopted. The smelting process is as follows: white heat the charge in the regenerative furnace to melt it, then add iron ore and heat it to boiling until the iron ore is reduced by carbon. Open hearth furnace materials include molten iron, solid pig iron, scrap steel and some iron ores. Scrap steel can be used in any proportion, but the most commonly used proportion is 50%. The open hearth fuel is natural gas, fuel oil, coal powder, and gas. open hearth steelmaking has strong adaptability to raw materials, many smelting steels, high production quality and uniform performance. In the middle of the 20th century, open hearth steelmaking was the most important steelmaking method. However, the investment in open hearth furnace construction is large, the smelting time is long, and the production efficiency is significantly lower than that of converter and electric steelmaking steelmaking. Therefore, open hearth steelmaking has been basically eliminated in the world.

Classification